Reversing-valve for steam-engines



No. 752,401. PATENTE!) FEB. 16, 1904. E. KROMEB.. REVBRSING VALVE .POR STEAM ENGINES.

APPLI'OATIQN FILED MAR. 1s, 190s. No Movin.. A v x asuma-SHEET 1.

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PATENTED PEB. 16, 1904.

E. KRQMER.

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INVENTUR Y cmomm women MZ AT ORNEY -mi mams i- REVERSNG VALVE EUR STEAM ENGINES.

No MODEL.

APPLIGATION FILED MAR. 16, 1903.

WITN ESSES pointed out hereinafter.

.provement in Reversing-Valves for Steaml ivo. 752,401. y

UNITED STATES EMANUEL KROMER,

I Patented February 16, 1904. PATENT OFFICE.

OF NEWT-ARK, OHIO.

lFIEVERSING-VALVE FOR STEAM-ENGINES.'

SPECIFICATION forming part of Letters Patent No. "752,401, dated February 16, 1904.,

Application led March 16, 1903.

To all whom it may concern:

Engines, of which the following is a specification.

My invention relates to steam-engine piston-valves; and the objects of my invention are to provide an improved valve construction whereby a reversal in the motion of the engine may be attained in a simple and'effective manner without the employment of Y the usual connections between the valve-rod. and eccentric and to produce other improvements the details of which will be more fully These objects I accomplish in the manner illustrated in the ac-' companying drawings, in which- Figure l is a longitudinal section through a steam-chest and a portion of the cylinder,. showing my improved valve therein. Fig. 2 is a similar view showing the relative position` of the parts when the piston 'is traveling in the opposite direction from that shown in Fig. 1. Fig. 3 is la similar view showing the position of the valve when the same has been' thrown for reversal of the engine. Fig. 4 is a transverse section on line w of Fig. 1; and Fig. 5 is a view in elevation of vaV steam cylinder and chest, showing the reverse lever and valve connections.

Similar numerals refer to similar parts throughout the several views. l

1 represents a steam-engine cylinder, and 2 the steam-chest, which yprojects therefrom in the usual manner.

3 represents the valve-seat, which is formed in the usual manner by the surface of the bottom of the steam-chest, which lsteam-chest bottom forms the partition between the steamchest and cylinder. In this partition or steamchest bottom I form a central recess or depression 4, from which leads outward an eX haust-passage 5. On one side of the recess rcated, respectively, at 12, 13, and 14, the cen- -openings, through which extend loosely `bolts 4 and separated therefrom and from each Serial No. 147,935. (No model.)

tral port 12 being twice the width of either the end ports 13 or 14. The solid portion of vthe valve-plate 11, which I have indicated at 11SL and which is at the inner end thereof, has a width equal to three times the width of the port 13 and the solid portion between the port 13 and the port 12, while thesolid partition 1113 between the ports 13 and: 12 has a width equal to twice the width. of said port 13. The solid portion, which I have indicated atllc andwhichis between the ports 12 and and 14, has a width equal to that of the inner end portion 11B. YConnected with what we will term the "outer"7 end of the valve-plate is a valve-rod 15, the latter .extending outward through one end of thesteam-.chest and through a suitable packing-box, which is indicated at 16. Y Mountedcentrally within the steam-chest is a valve-cap, which is indicated at 17, this valve-cap being of such length as to embrace lthe ports 7 4, and 5 and being provided near each end with transverse bars 17 and 17h, which extend between the side walls of said cap and between which and the valve-seat the vvalve 11 is adapted kto slide. As indicated more clearly in Fig. 4.of the drawings, the cap 17 has its lower side in frictional contact with thevvalve-plateandfhas its outturned base-flanges 17c provided with 18, the threaded lower ends of the latterengaging threaded sockets in the base of the steam-chest. Between the cap-flanges 1'?c and the enlarged heads of the bolts 18 are interposed coiled springs 19, the latter being adapted to hold the valve-cap and valve-plate in position when there is no steam-pressure.

Theouter end of the valve-rod 15, as shown in Fig. 5 of the drawings, has a pivotal connection with an upright bar 20, the upper end of which has connected therewith one end of the usual eccentric-rod 21. The lower end of the bar 2O is pivotally connected with one end of a connecting-bar 22, the pivot-pin 23 thereof passing through a curved slotted opening 24 in asuitably-mounted upright bracket 25. The outer end of the connecting-bar 22 has a pivotal connection with a hand-lever 26, said lever being pivoted at its lower end to a fixed bracket 27, the upper portion of which is in the nature of a notched segment and with the desired notch of which is adapted to engage a pivoted pawl 28, which is preferably operated in the well-known manner through the medium of a rod 28, which connects said pawl with a'pivoted inger-lever 29.

Assuming that the valve 11 is in a position shown in Fig. 1 of the drawings-that is, with the ports 14 and 8, 12 and 4, and 13 and 5 in communication and the ports 7 and 6 closedit is obvious that the steam which enters the steam-chest through the inlet 2EL will, following the directionpof'the arrows, pass through the connected ports 14 and 8 'and passage 10 into the end of the cylinder to the right, operating to move the piston, a portion of which is shown at 30, in the direction of the unfeathered arrow and in permitting the steam in front of said piston to exhaust through the passage 9 and ports 5, 13, and 12. In the next or following movement of the eccentric-rod it is obvious that the valve will be moved to the position shown in Fig. 2, in which position the ports 8 and 5 will be closed and the ports 7 and 6 open. When the valve is in this position, it is obvious that the movement of the piston within the cylinder will be in the opposite direction from that indicated by the unfeathered arrow in Fig. y1. In the above-described manner the usual reciprocating motion will be imparted to the piston and the valve.

Assuming now that it is desired to reverse the motion of the engine and that the parts are in the position illustrated in Fig. 2 or that the piston shown therein has been moved partially toward the opposite end of the cylinder, the lever 26 is pulled in the direction of the arrow in Fig. 5, with the result that the valve is moved inthe same direction. During such movement it is obvious from the relative dimensions of the solid portions of the valve heretofore described that all of the ports, with the exception of the exhaust-port, will be closed and that a continuation of the outward pull of the lever and a consequent continuance of the movement of the valve will result in the ports 8 and 5 being opened and in a consequent movement of the `live steam through the passage 10 and in a return of the piston toward the end of the cylinder to the left. The next or following operation of the eccentric-rod results in a still greater movement of the valve to the right until the parts are in the position shown in Fig. 8, in which position it is obvious that the piston will again Abevdriven to the right, owing to the opening of the port 6 and the exhaust-port 7. The usual reciprocating movement of the valve must now result, as will readily be understood, in the running of the moving parts of the engine in the opposite direction from that first described. While it is obvious that the lpressure of steam within theI steam-chest may serve to hold the cap 17 in proper frictional engagement with the slide-valve, it will be understood that the cap will be assisted in being held in this position through the medium of the springs 19 when there is no steam-pressure.

Owing to the bearing or direct contact of the base-flange of the cap on the wall between the chest and cylinder, an undesirable pressure of the cap on the sliding valve, which may be due to steam-pressure on said cap, is obviated. From the construction herein shown and described it will be seen that a simple and reliable valve mechanism is provided whereby a reversal of an engine may be readily and.

simply accomplished without the movement of the usual link or other mechanism.

Having now fully described my invention, what I claim, and desire to secure by Letters Patent, is-

I. In a valve mechanism for steam-cylinders, the combination with a cylinder and steam.- chest, the wall between said parts having passages leading to opposite ends of the cylinder and each of said passages communicating with the steam-chest through two ports as 8 and 7 and 5 and 6, and said wall or partition having a central exhaust-port, of a valve-plate 11 slidably mounted on said wall or partition, said slide-valve having three-ports formed therein, a fixed cap over said slide-valve and of such length as to embrace the ports 5 and 7, said valve adapted when reciprocated to alternately open and close the ports 7 and 8 and 5 and 6 as described, substantially as specified.

2. In a valve construction for steam-engine cylinders, the combination with a cylinder and steam-chest, the wall between said cylinder and chest having a central exhaust-port and passages on opposite sides of the exhaust-port leading to opposite ends of the cylinder and each of said passages having a pair of inletports as 7 8 and 5 6, of a slidable'valve having ports 12, 13 and 14, the solid inner end IOO IIO

portion of said valve having e Width equal to `7 and ymeans for imparting a sliding movethree times the Width of either of the ports ment to said Valveby hand, substantially as IO 5, 7 or 8, :lits solid portionhbetveln gortsh 13 and `for the purpose specified. an 12 .equa to two times t e Wi t o eit er 5 ofvsaid ports 5, 6, 7 or S and its solid por- EMANUEL KROMER' tion between ports 12 and 14 equal in Width In presence ofto said inner end solid portion, a fixed cap F. L. WooDBRIDGE, over said valve and embracing the ports 5 and A. D. HAYES. 

